It introduces research background of the paper , research states of in home and abroad , major research content , classifying and operating principle of sprag overrunning clutch . a method is discussed for sprag overrunning clutches design , including configuration design , force analysis and fea . a computer program is developed and applied to the h - tech project 本文首先简要介绍了论文研究的背景、国内外的研究现状、主要研究内容、超越离合器的分类和斜撑超越离合器的工作原理；然后，详细阐述了运用现代先进技术开发高速斜撑超越离合器的结构设计方法、受力计算方法和有限元分析方法。
Steel frame with welding joint easily occur brittle collapse because of having a low ductility at joints . then , a semi - rigid connected steel frame has large the energy absorption capacity which can resist dynamic loads and the using steel qualities of bracing system and joints are small . so adopting a semi - rigid jointed steel frame is economical and stable 采用焊接刚性节点的钢框架因节点延性较差容易发生脆性破坏，而半刚接钢框架因节点具有较强的耗能能力可以抵抗一定的地震荷载，同时还可以减少斜撑的数量及节点用钢量，这使得半刚接钢框架成为一种经济、可靠的选择。
